KR20210113382A - Journal bearing structure and supercharger having same - Google Patents

Abstract

A journal bearing 21 for supporting a rotating shaft by an inner circumferential surface 21a, and a bearing housing 15C for holding an outer circumferential surface 21b of the journal bearing 21 by the inner circumferential surface 21a; Silver has a supply hole 21c for communicating the inner peripheral surface 21a and the outer peripheral surface 21b, the bearing housing 15C has a supply hole 15b that opens toward the inner peripheral surface 15a, and the bearing housing 15C Journal bearing structure ( 100) is provided.

Description

Journal bearing structure and supercharger having same

The present invention relates to a journal bearing structure and a supercharger provided therewith.

Conventionally, a journal bearing structure supporting a radial load (radial load) of a rotating shaft is known (for example, refer to Patent Document 1). Patent Document 1 discloses that a pair of journal bearing structures support a radial load of a rotating shaft integrally formed with a turbine of an exhaust turbine supercharger.

Japanese Laid-Open Patent Publication No. 2018-145942

The journal bearing structure is constituted by, for example, a journal bearing (bush metal) supporting a rotating shaft and a bearing housing, and the journal bearing is held in the bearing housing by press-fitting the journal bearing into the bearing housing. Further, for example, in the journal bearing and the bearing housing, in order to supply lubricating oil to the gap between the journal bearing and the rotation shaft, oil supply holes are formed at the same position in the circumferential direction around the axis of the rotation shaft, respectively. Since the oil supply hole is formed at the same position in the circumferential direction, the lubricant oil supplied to the oil supply hole of the bearing housing is supplied to the gap between the journal bearing and the rotary shaft through the oil supply hole of the journal bearing.

However, for example, when the rotation shaft and the journal bearing are seasoned and the state in which the journal bearing is press-fitted into the bearing housing is released, the positions in the circumferential direction of the oil supply hole of the bearing housing and the oil hole of the journal bearing become different positions. . In this case, the oil supply hole of the bearing housing and the oil supply hole of the journal bearing do not communicate with each other, and the lubricant oil is not supplied to the gap between the journal bearing and the rotating shaft.

The present invention was made in view of such circumstances, and a journal bearing structure capable of supplying lubricating oil to the gap between the journal bearing and the rotating shaft even when the circumferential positions of the oil supply hole of the journal bearing and the oil supply hole of the bearing housing are different. aims to provide

In order to solve the above problems, the journal bearing structure according to one aspect of the present invention employs the following means.

A journal bearing structure according to an aspect of the present invention includes: a journal bearing having a first inner circumferential surface and a first outer circumferential surface formed in a cylindrical shape extending along an axis, and supporting a rotating shaft by the first inner circumferential surface; and a bearing housing having a second inner circumferential surface extending in a cylindrical shape and holding the first outer circumferential surface of the journal bearing by the second inner circumferential surface, wherein the journal bearing includes the first inner circumferential surface and the first outer circumferential surface at least one of the second inner circumferential surface of the bearing housing and the first outer circumferential surface of the journal bearing; A lubricating groove extending in the circumferential direction around the axis and guiding the lubricating oil discharged from the second lubricating hole to the first lubricating hole is formed.

According to the journal bearing structure according to one aspect of the present invention, an oil supply groove is formed in at least either of the second inner peripheral surface of the bearing housing and the first outer peripheral surface of the journal bearing. Therefore, even if the state in which the journal bearing is held by the bearing housing is released and the positions of the first and second oil holes in the circumferential direction are different from each other, the lubricant discharged from the second oil hole is guided to the first oil hole. is maintained Accordingly, it is possible to provide a journal bearing structure capable of supplying lubricating oil to the gap between the journal bearing and the rotating shaft even when the positions in the circumferential direction of the oil supply hole of the journal bearing and the oil supply hole of the bearing housing are different.

The journal bearing structure which concerns on one aspect of this invention WHEREIN: The said oil supply groove|channel may be formed in the said 2nd inner peripheral surface of the said bearing housing. Since the lubrication groove is formed on the bearing housing side, it is possible to suppress the reduction in strength due to the thinning of the journal bearing.

In the journal bearing structure according to one aspect of the present invention, the oil supply groove may be formed in the first outer peripheral surface of the journal bearing. Since the lubrication groove is formed on the journal bearing side, it is possible to easily perform the processing for forming the lubrication groove compared to the case where it is formed on the bearing housing side.

In the journal bearing structure according to one aspect of the present invention, the width in the axial direction of the oil supply groove may be less than or equal to the width in the axial direction of the second oil supply hole. If the axial width of the lubrication groove is wider than the axial width of the second lubrication hole, the area in which the second inner peripheral surface of the bearing housing holds the first outer peripheral surface of the journal bearing is reduced, and the holding force of the journal bearing by the bearing housing is reduced. this will lower In the journal bearing structure according to one aspect of the present invention, since the width in the axial direction of the oil supply groove is equal to or less than the width in the axial direction of the second oil supply hole, the above-described problem can be suppressed.

In the journal bearing structure according to one aspect of the present invention, the oil supply groove may be formed on the entire circumference of the perimeter of the axis in the circumferential direction. Since the lubrication groove is formed on the entire circumference in the circumferential direction, the lubrication groove removes from the second lubrication hole by the lubrication groove even when the circumferential position of the lubrication hole of the bearing housing and the lubrication hole of the journal bearing has any circumferential positional relationship. 1 Lubricating oil can be supplied reliably through the oil supply hole.

In the journal bearing structure according to one aspect of the present invention, the first position in the circumferential direction at which the first oil supply hole is arranged and the second position in the circumferential direction at which the second oil supply hole is arranged may be different. Even if the positions in the circumferential direction of the first oil supply hole and the second oil supply hole are different from each other, lubricant oil can be supplied from the second oil supply hole to the first oil supply hole through the oil supply groove. Therefore, for example, when attaching a journal bearing to a bearing housing, since it is not necessary to make the position of the circumferential direction of a 1st oil supply hole and a 2nd oil supply hole coincide, a mounting operation becomes easy. In addition, since lubricating oil is supplied through the lubrication groove even if the number of second lubrication holes formed in the bearing housing is smaller than the number of first lubrication holes formed in the journal bearing, the oil supply system for supplying lubricating oil to the bearing housing can be simplified. can

According to the present invention, it is possible to provide a journal bearing structure capable of supplying lubricating oil to the gap between the journal bearing and the rotating shaft even when the positions in the circumferential direction of the oil supply hole of the journal bearing and the oil supply hole of the bearing housing are different.

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal sectional view which shows the whole structure of the exhaust turbine supercharger of 1st Embodiment.
FIG. 2 is a partially enlarged view of a portion A shown in FIG. 1 .
FIG. 3 is a cross-sectional view taken from arrow II of the journal bearing structure shown in FIG. 2 .
FIG. 4 is a partially enlarged view of a portion A shown in FIG. 1 .
5 : is sectional drawing seen from II-II arrow of the journal bearing structure shown in FIG.
Fig. 6 is a partially enlarged view of a portion A shown in Fig. 1 .
Fig. 7 is a cross-sectional view taken from the arrow III-III of the journal bearing structure shown in Fig. 6 .
Fig. 8 is a partially enlarged view of a portion A shown in Fig. 1 .
Fig. 9 is a cross-sectional view taken from the arrow IV-IV of the journal bearing structure shown in Fig. 8 .

[First Embodiment]

EMBODIMENT OF THE INVENTION Hereinafter, the exhaust turbine supercharger of 1st Embodiment of this invention is demonstrated using FIG.

As shown in FIG. 1 , the exhaust turbine supercharger 11 is mainly comprised by the turbine 12, the compressor 13, and the rotating shaft 14, and these are accommodated in the housing 15. As shown in FIG.

The housing 15 is hollow inside, and the turbine housing 15A which forms the 1st space part S1 which accommodates the structure of the turbine 12, and the 2nd space which accommodates the structure of the compressor 13. It has the compressor housing 15B which comprises the part S2, and the bearing housing 15C which comprises the 3rd space part S3 which accommodates the rotation shaft 14. The 3rd space part S3 of the bearing housing 15C is located between the 1st space part S1 of the turbine housing 15A, and the 2nd space part S2 of the compressor housing 15B.

The rotary shaft 14 is supported so as to be able to rotate freely by a journal bearing 21 whose end on the turbine 12 side is a turbine-side bearing, and a journal bearing 22 whose end on the compressor 13 side is a compressor-side bearing. It is supported so that it can rotate freely by , and the movement in the axial direction in which the rotating shaft 14 extends is regulated by the thrust bearing 23. As shown in FIG. As for the rotating shaft 14, the turbine wheel 24 of the turbine 12 is being fixed to one end in the axial direction.

The turbine wheel 24 is accommodated in the 1st space part S1 of 15 A of turbine housings, and the some turbine blade 25 is formed in the outer peripheral part at predetermined intervals in the circumferential direction. Moreover, the screw part 37 is formed in the other end in the axial direction, and the rotating shaft 14 is fastened to the screw hole 38 of the compressor impeller 26 of the compressor 13. The compressor impeller 26 is accommodated in the 2nd space part S2 of the compressor housing 15B, and the some blade|wing 27 is formed in the outer peripheral part at predetermined intervals in the circumferential direction.

In the turbine housing 15A, an exhaust gas inlet passage 31 and an exhaust gas outlet passage 32 are formed with respect to the turbine blade 25 . And 15 A of turbine housings can drive and rotate the turbine 12 when the exhaust gas flow which flows in from the inlet passage 31 is guide|induced to the some turbine blade 25. As shown in FIG. In the compressor housing 15B, an intake port 34 and a compressed air discharge port 35 are formed with respect to the compressor impeller 26 . The air compressed by the compressor impeller 26 is discharged to the compressed air discharge port 35 .

Therefore, the turbine 12 drives this exhaust turbine supercharger 11 by the exhaust gas discharged|emitted from the engine (not shown), the rotation of the turbine 12 is transmitted to the rotating shaft 14, and the compressor 13 drives, and this compressor 13 compresses the combustion gas and supplies it to the engine. Accordingly, the exhaust gas from the engine passes through the exhaust gas inlet passage 31 , and the exhaust gas flow is guided to the plurality of turbine blades 25 , whereby the turbine wheel 24 to which the plurality of turbine blades 25 are fixed. ) through which the turbine 12 drives and rotates.

And the exhaust gas which drove the some turbine blade 25 is discharged|emitted from the outlet passage 32 to the outside. On the other hand, when the rotating shaft 14 rotates by the turbine 12, the integral compressor impeller 26 rotates, and air is sucked in through the suction port 34. As shown in FIG. The sucked air is pressurized by the compressor impeller 26 to become compressed air, and this compressed air is supplied to the engine from the compressed air discharge port 35 .

Next, the journal bearing structure 100 of this embodiment is demonstrated with reference to drawings. The journal bearing structure 100 of this embodiment is a bearing structure which supports the rotating shaft 14, Comprising: The journal bearing 21 and 15 C of bearing housings are provided. Hereinafter, although the journal bearing 21 is demonstrated, since the structure of the journal bearing 22 is the same as that of the journal bearing 21, description is abbreviate|omitted.

2 and 4 are partially enlarged views of part A shown in FIG. 1 , and show the journal bearing structure 100 of the present embodiment. 3 : is sectional drawing seen from the II arrow of the journal bearing structure 100 shown in FIG. 5 : is sectional drawing seen from II-II arrow of the journal bearing structure 100 shown in FIG. 2 to 5 , the axis X is the central axis of the rotation shaft 14 shown in FIG. 1 , but illustration of the rotation shaft 14 is omitted. Hereinafter, the journal bearing structure 100 shown in FIG. 2 and FIG. 3 is mainly demonstrated, and description of the structure which has the same code|symbol in the journal bearing structure 100 shown in FIGS. 4 and 5 is abbreviate|omitted.

The journal bearing structure 100 shown in FIG. 2 and FIG. 3 shows the state in which the circumferential direction position of the oil supply hole 21c of the journal bearing 21 and the oil supply hole 15b of 15C of bearing housings corresponded. On the other hand, the journal bearing structure 100 shown in FIGS. 4 and 5 shows a state in which the circumferential position of the oil supply hole 21c of the journal bearing 21 and the oil supply hole 15b of the bearing housing 15C in the circumferential direction differs. . The journal bearing structure 100 shown in Figs. 2 and 3 shows a state at the beginning of manufacture, and the journal bearing structure 100 shown in Figs. It shows the state after the state in which the journal bearing 21 was press-fitted into the bearing housing 15C was released at least temporarily.

2 and 3 , the journal bearing 21 has an inner peripheral surface (first inner peripheral surface) 21a formed in a cylindrical shape extending along the axis X, and a circle extending along the axis X. It is a cylindrical member which has the outer peripheral surface (1st outer peripheral surface) 21b formed normally. The journal bearing 21 supports the rotating shaft 14 by the inner peripheral surface 21a. The journal bearing 21 is attached to the bearing housing 15C by being press-fitted into the bearing housing 15C.

The journal bearing 21 has the back metal 21A formed in the cylindrical shape extended along the axis line X, and the bearing metal 21B joined to the inner side of the back metal 21A. The back metal 21A is formed of a metal material such as iron. The bearing metal 21B is formed of metal materials, such as a copper alloy and platinum.

Journal bearing 21 has oil supply hole (1st oil supply hole) 21c which extends in the radial direction orthogonal to the axis line X, and opens to both of the inner peripheral surface 21a and the outer peripheral surface 21b. The oil supply hole 21c connects the inner peripheral surface 21a and the outer peripheral surface 21b, and supplies the lubricating oil supplied from the bearing housing 15C to the clearance gap between the inner peripheral surface 21a and the rotating shaft 14. As shown in FIG. As shown in FIG. 3 , in the journal bearing 21, three oil supply holes 21c are formed at three points at intervals of 120° in the circumferential direction around the axis X. As for the oil supply hole 21c, you may make it provide an arbitrary number, such as only one, two at 180 degree intervals, and four at 90 degree intervals.

A recess 21d in which the bearing metal 21B forming the inner peripheral surface 21a is not formed is formed around the oil supply hole 21c on the inner peripheral side of the journal bearing 21 . The recessed portion 21d is a region recessed toward the outer peripheral surface 21b side rather than the peripheral inner peripheral surface 21a. Lubricating oil flowing out from the oil supply hole 21c is guided between the inner circumferential surface 21a and the rotation shaft 14 by the rotation of the rotation shaft 14 in a state where a constant amount is maintained in the recess 21d. By forming the recessed portion 21d, the lubricating oil discharged from the oil supply hole 21c can be smoothly guided between the inner peripheral surface 21a and the rotating shaft 14.

2 and 3 , the bearing housing 15C has an inner circumferential surface (second inner circumferential surface) 15a formed in a cylindrical shape extending along the axis X, and the journal bearing is formed by the inner circumferential surface 15a. It is a member holding the outer peripheral surface 21b of (21). The bearing housing 15C holds the journal bearing 21 by press-fitting the outer peripheral surface 21b of the journal bearing 21 with respect to the inner peripheral surface 15a.

The bearing housing 15C has an oil supply hole (second oil supply hole) 15b and an oil supply groove 15c. The oil supply hole 15b is a through hole which extends in the radial direction orthogonal to the axis line X and opens toward the inner peripheral surface 15a. Lubricating oil supplied from an oil supply system (not shown) formed inside the bearing housing 15C is supplied to the oil supply hole 15b through the oil supply groove 15c described later to the oil supply hole 21c of the journal bearing 21. supply

As shown in FIG. 3 , in the bearing housing 15C, three oil supply holes 15b are provided at intervals of 120° in the circumferential direction around the axis X so as to correspond to the oil supply holes 21c of the journal bearing 21 . It is formed at three points. The number of the oil supply holes 15b may be equal to that of the oil supply holes 21c, such as one, two at 180° intervals, and four at 90° intervals.

The oil supply groove 15c is a groove which extends along the circumferential direction around the axis X, is formed on the entire circumference of the circumferential direction, and has a depth in the radial direction. The oil supply groove 15c is formed in the inner peripheral surface 15a of the bearing housing 15C, and is recessed in the direction away from the axis line X. The oil supply groove 15c guides the lubricating oil discharged from the oil supply hole 15b to the oil supply hole 21c of the journal bearing 21 . The oil supply groove 15c of this embodiment is formed in the inner peripheral surface 15a of the bearing housing 15C, and is not formed in the outer peripheral surface 21b of the journal bearing 21. As shown in FIG. Therefore, it can suppress that the journal bearing 21 is thinned and intensity|strength falls.

As shown in FIG. 2, the width W1 of the axial line X direction of the oil supply groove 15c is substantially equal to the width W2 of the axial line X direction of the oil supply hole 15b. The width of the oil supply hole 15b and the oil supply hole 21c is equal to W2, respectively. Since the oil supply hole 15b is a circular hole in a cross-sectional view, the width W2 of the oil supply hole 15b in the axial line X direction coincides with the diameter of the oil supply hole 15b. It is preferable that the width W1 and the width W2 have a relationship such as, for example, the following formula (1).

W1 ≤ W2 (1)

By setting the width W1 of the oil supply groove 15c to be less than or equal to the width W2 of the oil supply hole 21c, the contact area between the bearing housing 15C and the journal bearing 21 is sufficiently ensured, and the journal bearing 21 ) is to reliably maintain the state fixed to the bearing housing 15C by press-fitting.

The journal bearing structure 100 shown in FIG. 2 and FIG. 3 shows the state in which the circumferential direction position of the oil supply hole 21c of the journal bearing 21 and the oil supply hole 15b of 15C of bearing housings corresponded. The journal bearing structure 100 shown in FIG. 2 and FIG. 3 has shown the state at the beginning of manufacture. As indicated by an arrow in Fig. 3, the lubricant oil guided from the oil supply hole 15b to the oil supply groove 15c flows in a circumferential direction along the oil supply groove 15c, but mainly flows through the oil supply hole in the radial direction. (21c) is introduced. As for this, the oil supply hole 21c is arrange|positioned on the extension line in the inflow direction of the lubricating oil which flowed into the oil supply groove 15c from the oil supply hole 15b, and also the oil supply hole 21c with respect to the opening area of the oil supply groove 15c. This is because the opening area of

On the other hand, the journal bearing structure 100 shown in FIGS. 4 and 5 shows a state in which the circumferential position of the oil supply hole 21c of the journal bearing 21 and the oil supply hole 15b of the bearing housing 15C in the circumferential direction differs. . In the journal bearing structure 100 shown in Figs. 4 and 5, the rotation shaft 14 and the journal bearing 21 are aged by use, and the state in which the journal bearing 21 is press-fitted into the bearing housing 15C is at least temporarily. indicates the state after being released.

As shown in FIG. 5, the position in the circumferential direction of the oil supply hole 21c of the journal bearing 21 and the oil supply hole 15b of the bearing housing 15C becomes a position different by the angle θ around the axis X, have. As indicated by the arrow in Fig. 5, the lubricant oil guided from the oil supply hole 15b to the oil supply groove 15c flows in the circumferential direction along the oil supply groove 15c, and then flows into the oil supply hole 21c in the radial direction. do.

In the state shown in FIG.4 and FIG.5, when the oil supply groove|channel 15c is not formed, the edge part on the inner peripheral side of the oil supply hole 15b is blocked by the outer peripheral surface 21b of the journal bearing 21. As shown in FIG. Therefore, it will be in the state in which lubricating oil is not supplied from the oil supply hole 15b of the bearing housing 15C to the oil supply hole 21c of the journal bearing 21. As shown in FIG. On the other hand, in the bearing housing 15C of this embodiment in which the oil supply groove 15c is formed, the circumferential direction position of the oil supply hole 21c of the journal bearing 21 and the oil supply hole 15b of 15C of bearing housings. Even in a different state, lubricating oil can be supplied from the oil supply hole 15b to the oil supply hole 21c.

The action and effect which the journal bearing structure 100 of this embodiment demonstrated above demonstrates is demonstrated.

According to the journal bearing structure 100 of this embodiment, the oil supply groove 15c is formed in the inner peripheral surface 15a of 15 C of bearing housings. Therefore, even if the state held by the bearing housing 15C of the journal bearing 21 is cancelled|released and the position in the circumferential direction of the oil supply hole 15b and the oil supply hole 21c becomes a different position, it discharges from the oil supply hole 15b. The state in which the used lubricating oil is guided to the oil supply hole 21c is maintained. Therefore, even if the circumferential position of the oil supply hole 21c of the journal bearing 21 and the oil supply hole 15b of the bearing housing 15C becomes a different state, lubricating oil enters the clearance gap between the journal bearing 21 and the rotating shaft 14. It is possible to provide a journal bearing structure 100 capable of supplying

In the journal bearing structure 100 of the present embodiment, the width W1 of the oil supply groove 15c in the axial line X direction is substantially the same as the width W2 of the oil supply hole 15b in the axis line X direction. do. If the width W1 in the axial (X) direction of the oil supply groove 15c is too wide than the width W2 in the axial (X) direction of the oil supply hole 15b, the inner peripheral surface 15a of the bearing housing 15C becomes the journal The area which holds the outer peripheral surface 21b of the bearing 21 decreases, and the holding force of the journal bearing 21 by the bearing housing 15C falls.

In addition, when the width W1 of the oil supply groove 15c in the axial line X direction is too narrow than the width W2 of the oil supply hole 15b in the axis line X direction, ), the supply of lubricating oil to the In the journal bearing structure 100 of this embodiment, since the width|variety of the axial line (X) direction of the oil supply groove|channel 15c and the oil supply hole 15b is substantially the same, the above-mentioned problem can be suppressed.

In the journal bearing structure 100 of the present embodiment, the oil supply groove 15c is formed on the entire circumference of the circumference of the axis X in the circumferential direction. Since the oil supply groove 15c is formed on the entire circumference in the circumferential direction, the circumferential position of the oil supply hole 15b of the bearing housing 15C and the oil supply hole 21c of the journal bearing 21 in the circumferential direction is any circumferential position. Even in the case of a relationship, lubricating oil can be reliably supplied from the oil supply hole 15b to the oil supply hole 21c by the oil supply groove 15c.

[Second Embodiment]

Next, the exhaust turbine supercharger of 2nd Embodiment of this invention is demonstrated. This embodiment is a modified example of 1st Embodiment, Except for the case where it demonstrates in particular below, it assumes the same thing as 1st Embodiment, and abbreviate|omits description below. The exhaust turbine supercharger of this embodiment is the same as that of 1st Embodiment except a journal bearing structure.

In the journal bearing structure 100 of the first embodiment, an oil supply groove 15c extending circumferentially around the axis X was formed in the inner peripheral surface 15a of the bearing housing 15C. On the other hand, in the journal bearing structure 100A of this embodiment, the oil supply groove 21e is formed in the outer peripheral surface 21b of the journal bearing 21. As shown in FIG.

6 and 8 are partially enlarged views of part A shown in FIG. 1 , and show the journal bearing structure 100A of the present embodiment. 7 : is sectional drawing seen from III-III arrow of 100 A of journal bearing structures shown in FIG. 9 : is sectional drawing seen from IV-IV arrow of 100 A of journal bearing structures shown in FIG. 6 to 9 , the axis X is the central axis of the rotation shaft 14 shown in FIG. 1 , but illustration of the rotation shaft 14 is omitted. Hereinafter, the journal bearing structure 100A shown in FIG. 6 and FIG. 7 is mainly demonstrated, and description of the structure which has the same code|symbol in the journal bearing structure 100 shown in FIG. 8 and FIG. 9 is abbreviate|omitted.

The journal bearing structure 100A shown in FIG. 6 and FIG. 7 shows the state in which the position of the circumferential direction of the oil supply hole 21c of the journal bearing 21 and the oil supply hole 15b of 15 C of bearing housings coincided. On the other hand, the journal bearing structure 100A shown in FIGS. 8 and 9 shows a state in which the circumferential position of the oil supply hole 21c of the journal bearing 21 and the oil supply hole 15b of the bearing housing 15C in the circumferential direction differs. .

The journal bearing structure 100A shown in Figs. 6 and 7 shows a state at the beginning of manufacture, and the journal bearing structure 100A shown in Figs. It shows the state after the state in which the journal bearing 21 was press-fitted into the bearing housing 15C was released at least temporarily.

The journal bearing 21 has an oil supply groove 21e. The oil supply groove 21e is a groove which extends along the circumferential direction around the axis X, is formed on the entire circumference of the circumferential direction, and has a depth in the radial direction. The oil supply groove 21e is formed in the outer peripheral surface 21b of the journal bearing 21, and is recessed in the direction approaching the axis line X. The oil supply groove 21e guides the lubricating oil discharged from the oil supply hole 15b to the oil supply hole 21c of the journal bearing 21 .

As shown in FIG. 6, the width W3 of the axial line X direction of the oil supply groove 21e is substantially equal to the width W2 of the axial line X direction of the oil supply hole 15b. The width of the oil supply hole 15b and the oil supply hole 21c is equal to W2, respectively. Since the oil supply hole 15b is a circular hole in a cross-sectional view, the width W2 of the oil supply hole 15b in the axial line X direction coincides with the diameter of the oil supply hole 15b. It is preferable that the width W3 and the width W2 have a relationship such as, for example, the following formula (2).

W3 ≤ W2 (2)

When the width W3 of the oil supply groove 21e is equal to or less than the width W2 of the oil supply hole 15b, the contact area between the bearing housing 15C and the journal bearing 21 is sufficiently secured, and the journal bearing 21 ) is to reliably maintain the state fixed to the bearing housing 15C by press-fitting.

The journal bearing structure 100A shown in FIG. 6 and FIG. 7 shows the state in which the position of the circumferential direction of the oil supply hole 21c of the journal bearing 21 and the oil supply hole 15b of 15 C of bearing housings coincided. The journal bearing structure 100A shown in FIG. 6 and FIG. 7 has shown the state at the beginning of manufacture. As indicated by an arrow in Fig. 7, the lubricant oil guided from the oil supply hole 15b to the oil supply groove 21e flows in a circumferential direction along the oil supply groove 21e, but mainly flows through the oil supply hole in the radial direction. (21c) is introduced. As for this, the oil supply hole 21c is arrange|positioned on the extension line in the inflow direction of the lubricating oil which flowed into the oil supply groove 21e from the oil supply hole 15b, and also the oil supply hole 21c with respect to the opening area of the oil supply groove 21e. This is because the opening area of

On the other hand, the journal bearing structure 100A shown in FIGS. 8 and 9 shows a state in which the circumferential position of the oil supply hole 21c of the journal bearing 21 and the oil supply hole 15b of the bearing housing 15C in the circumferential direction differs. . In the journal bearing structure 100 shown in Figs. 8 and 9, the rotation shaft 14 and the journal bearing 21 are aged by use, so that the state in which the journal bearing 21 is press-fitted into the bearing housing 15C is at least temporarily indicates the state after being released.

As shown in FIG. 9, the position in the circumferential direction of the oil supply hole 21c of the journal bearing 21 and the oil supply hole 15b of the bearing housing 15C becomes a position different by the angle θ around the axis X, have. As indicated by the arrow in Fig. 9, the lubricant oil guided from the oil supply hole 15b to the oil supply groove 21e flows in the circumferential direction along the oil supply groove 21e, and then flows into the oil supply hole 21c in the radial direction. do.

In the state shown in FIG.8 and FIG.9, when the oil supply groove|channel 21e is not formed, the edge part on the inner peripheral side of the oil supply hole 15b is blocked by the outer peripheral surface 21b of the journal bearing 21. As shown in FIG. Therefore, it will be in the state in which lubricating oil is not supplied from the oil supply hole 15b of the bearing housing 15C to the oil supply hole 21c of the journal bearing 21. As shown in FIG. On the other hand, in the journal bearing 21 of this embodiment in which the oil supply groove 21e is formed, the circumferential direction position of the oil supply hole 21c of the journal bearing 21 and the oil supply hole 15b of the bearing housing 15C. Even in a different state, lubricating oil can be supplied from the oil supply hole 15b to the oil supply hole 21c.

According to the journal bearing structure 100A of this embodiment demonstrated above, the oil supply groove|channel 21e is formed in the outer peripheral surface 21b of the journal bearing 21. As shown in FIG. Therefore, even if the state held by the bearing housing 15C of the journal bearing 21 is cancelled|released and the position in the circumferential direction of the oil supply hole 15b and the oil supply hole 21c becomes a different position, it discharges from the oil supply hole 15b. The state in which the used lubricating oil is guided to the oil supply hole 21c is maintained. Therefore, even if the circumferential position of the oil supply hole 21c of the journal bearing 21 and the oil supply hole 15b of the bearing housing 15C becomes a different state, lubricating oil enters the clearance gap between the journal bearing 21 and the rotating shaft 14. It is possible to provide a journal bearing structure 100A capable of supplying

The oil supply groove 21e of this embodiment is formed in the outer peripheral surface 21b of the journal bearing 21, and is not formed in the inner peripheral surface 15a of 15 C of bearing housings like 1st Embodiment. The journal bearing 21 is a smaller member than the bearing housing 15C. Therefore, the processing which forms the oil supply groove|channel 21e in the outer peripheral surface 21b of the journal bearing 21 is easier than the processing which forms the oil supply groove|channel 15c in the inner peripheral surface 15a of 15 C of bearing housings. According to this embodiment, the process of forming an oil supply groove|channel can be performed easily.

In the journal bearing structure 100A of the present embodiment, the width W3 of the oil supply groove 21e in the axial line X direction is substantially the same as the width W2 of the oil supply hole 15b in the axis line X direction. do. If the width W3 in the axial (X) direction of the oil supply groove 21e is excessively wider than the width W2 in the axial (X) direction of the oil supply hole 15b, the inner peripheral surface 15a of the bearing housing 15C becomes the journal The area which holds the outer peripheral surface 21b of the bearing 21 decreases, and the holding force of the journal bearing 21 by the bearing housing 15C falls.

In addition, when the width W3 of the oil supply groove 21e in the axial line X direction is too narrow than the width W2 of the oil supply hole 15b in the axis line X direction, ), the supply of lubricating oil to the In the journal bearing structure 100A of this embodiment, since the width|variety of the axial line X direction of the oil supply groove 21e and the oil supply hole 15b is substantially equal, the above-mentioned problem can be suppressed.

In the journal bearing structure 100A of this embodiment, the oil supply groove 21e is formed in the periphery of the circumferential direction around the axis line X. As shown in FIG. Since the oil supply groove 21e is formed on the entire circumference in the circumferential direction, the circumferential position of the oil supply hole 15b of the bearing housing 15C and the oil supply hole 21c of the journal bearing 21 in the circumferential direction is a certain circumferential position. Even in the case of a relationship, lubricating oil can be reliably supplied from the oil supply hole 15b to the oil supply hole 21c by the oil supply groove 21e.

[Other embodiment]

In the above description, although the oil supply groove|channel 15c and the oil supply groove|channel 21e were formed around the periphery of the axis line X, another aspect may be sufficient. For example, you may make it form the oil supply groove|channel 15c and the oil supply groove|channel 21e in a part of area|region (for example, the area|region for half circumference) of the circumferential direction around the axis line X.

In addition, in the above description, although the oil supply groove|channel was made to be provided in either one of the inner peripheral surface 15a of 15 C of bearing housings or the outer peripheral surface 21b of the journal bearing 21, another aspect may be sufficient. For example, you may provide the oil supply groove|channel in both the inner peripheral surface 15a of 15 C of bearing housings, and the outer peripheral surface 21b of the journal bearing 21. As shown in FIG. By providing the oil supply grooves on both sides, the volume of lubricating oil flowing through the oil supply grooves can be sufficiently secured. Thus, what is necessary is just to provide an oil supply groove|channel in at least either of the inner peripheral surface 15a of the bearing housing 15C, and the outer peripheral surface 21b of the journal bearing 21. As shown in FIG.

In the journal bearing structure 100 described above, the rotation shaft 14 and the journal bearing 21 are aged by use, and the state in which the journal bearing 21 is press-fitted into the bearing housing 15C is at least temporarily released. In this case, the position of the circumferential direction at which the oil supply hole 21c is arrange|positioned and the position of the circumferential direction at which the oil supply hole 15b is arrange|positioned become a different position.

On the other hand, as another aspect, from the time of manufacture of the journal bearing structure 100, the position in the circumferential direction where the oil supply hole 21c is arranged and the position in the circumferential direction where the oil supply hole 15b is arranged may be set to a different position. . In this case, for example, when mounting the journal bearing 21 to the bearing housing 15C, since it is not necessary to match the positions of the oil supply hole 21c and the oil supply hole 15b in the circumferential direction, the mounting operation is easy. becomes

Moreover, you may reduce the number of the oil supply holes 15b formed in the bearing housing 15C rather than the number of the oil supply holes 21c formed in the journal bearing 21. As shown in FIG. For example, the number of the oil supply holes 21c formed in the journal bearing 21 may be three, and the number of the oil supply holes 15b formed in the bearing housing 15C may be one. Even if the number of the oil supply holes 15b formed in the bearing housing 15C is smaller than the number of the oil supply holes 21c formed in the journal bearing 21, lubricating oil is supplied through the oil supply groove 15c, so that the bearing housing ( The oil supply system that supplies lubricating oil to 15C) can be simplified.

11 ; exhaust turbine supercharger
15C; bearing housing
15a; If you give me
15b; tanker
15c; refueling groove
21 ; journal bearing
21A; back metal
21B; bearing metal
21a; If you give me
21b; periphery
21c; tanker
21d ; recess
21e; refueling groove
22 ; journal bearing
100, 100A; Journal bearing structure
X ; axis

Claims (7)

A journal bearing having a first inner circumferential surface and a first outer circumferential surface formed in a cylindrical shape extending along an axis, the journal bearing supporting the rotating shaft by the first inner circumferential surface;
a bearing housing having a second inner circumferential surface formed in a cylindrical shape extending along the axis and holding the first outer circumferential surface of the journal bearing by the second inner circumferential surface;
The journal bearing has a first oil supply hole for communicating the first inner peripheral surface and the first outer peripheral surface,
The bearing housing has a second oil supply hole that opens toward the second inner circumferential surface,
At least either of the second inner circumferential surface of the bearing housing and the first outer circumferential surface of the journal bearing, while extending in the circumferential direction around the axis, lubricating oil discharged from the second oil supply hole is guided to the first oil supply hole Journal bearing structure with lubrication grooves. The method of claim 1,
The said oil supply groove|channel is formed in the said 2nd inner peripheral surface of the said bearing housing, The journal bearing structure. The method of claim 1,
The said oil supply groove is formed in the said 1st outer peripheral surface of the said journal bearing, The journal bearing structure. 4. The method according to any one of claims 1 to 3,
A journal bearing structure in which a width in the axial direction of the oil supply groove is equal to or less than a width in the axial direction of the second oil supply hole. 4. The method according to any one of claims 1 to 3,
The said oil supply groove|channel is formed in the whole perimeter of the circumferential direction around the said axis line, The journal bearing structure. 4. The method according to any one of claims 1 to 3,
A journal bearing structure in which a first position in the circumferential direction at which the first oil supply hole is disposed and a second position in the circumferential direction at which the second oil supply hole is disposed are different from each other. The journal bearing structure according to any one of claims 1 to 3,
the rotating shaft supported by the journal bearing structure;
A turbocharger having a compressor connected to the rotating shaft.

Images